The D.O.C. wrote damn near every lyrics on NWA's straight outta compton, plus "Eazy-Duz-It" including Cube's as Cube was in high school during the making of the album. That'll mean that Cube writing Eazy's rhymes isn't true.. As far as I understood, the only NWA member that wrote most of his lyrics was Ren.. DOC said this in a interview..

The D.O.C. got in the car accident which costed him his voice on the day where the video for The D.O.C. and the Doctor was filmed (see video here: http://www.youtube.com/watch?v=RiaSg...he%20doc%20nwa ).. He said that he got drunk at a party on the set afterwards and drove home.. that's were the accident happened..

The D.O.C. also wrote most of Dre's "The Chronic" and parts of Snoop's "Doggystyle".. He still is a ghostwriter.. Rumors says that he will write lyrics for Detox..